Grinding-mill.



C. H. HAMILTON.

GRINDING MILL. APPLIOATION FILED MAB.15. 1909.

Patented Dec; 28, 1909.

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GRINDING MILL. APPLICATION FILED MAR.15, 1909.

Patented Dec.28,1909.

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CHRISTOPHER HESKETH HAMILTON, OF WEST KENSINGTON, LONDON, ENGLAND.

GRINDING-MILL.

Specification 0% Letters Patent.

Patented Dec. 28, 1909.

Application filed March 15, 1909. Serial No. 483,387.

To all whom it may concern:

' Be it known that I, CHRISTOPHER Hnsnn'rrr HAMILTON, of 16 Newton Mansions, Queens Club Gardens, WVest Kensington, London, England, mining engineer, have invented certain new and useful Improvements in and Relating to Grinding-Mills, of which the following is a specification.

The object of my invention is certain improvements in the construction of tube or grinding mills, whereby they can be made to work equally as well as the ordinary mill but whereby increased capacity and greater etliciency are obtained.

The invention relates especially to the grinding of metal-bearing rocks and cement slag in which the material to be ground is churned within a cylinder with pebbles or metal balls or other suitable material.

A grinding mill constructed in accordance with this invention comprises a cylindrical or elliptical metal shell lined with silex, steel or other suitable material, mounted on bearings placed diagonally at the ends of the cylinder thus causing the cylinder to be out of the horizontal and to work eccentrically so that while retaining the rotary movement the material contained therein is caused to travel obliquely from end to end. The angle of eccentricity can be varied to meet the requirements of the material to be ground.

The metal shell is mounted on hollow trunnions which are adapted to form the inlet and outlet for the material to be ground. The cylinder may be provided with peripheral discharges which may take the form of gratings or grooves covered with gauze. Means are provided for rotating the cylinder.

Figure l is a sectional elevation of one form of grinding mill made in accordance with this invention; Fig. 2 is an end view of same part broken away; Fig. 3 is a plan; Figs. t and 5 are details of a modification.

a, is a cylindrical shell having spherical ends Z) and 0.

(Z and c are hollow trunnions provided with flanges f and 9 adapted to be bolted to the ends of the shell, the shell being provided with slots h and j, and bolts 70 70 so that the angular position of the shell can be adapted as required.

m m are liners in the trunnions the ends of which project into the slots 7L and 7'.

'n, n are filling pieces to close the ends of the slots h and j.

0 is a lining of sileX or other suitable material. In some cases gratings p and gauze Q forming peripheral discharges can be em ployed as shown in Figs. 4 and 5.

In use the obliquity of the cylinder is adjusted according to the nature 01 the material to be ground. Pebbles or metal balls are placed within the cylinder and the material is fed into the apparatus by the inlet 1". As the cylinder is rotated the balls and material are thrown obliquely from one end of the cylinder to the other, to and fro. In this manner the material is quickly and efiiciently ground to a slime, the ground material passing out of thehollow trunnions c and also through the gratings p when they are fitted.

In the improved machine the material is more etficiently and rapidly ground than by apparatus mounted centrally.

hat I claim and desire to secure by Letters Patent i. s:-

1. A grinding mill comprising in combination a metal shell lined with hard material, horizontal hollow trunnions whereon said shell is mounted, means for rotating the shell, and means for adjusting the shell eccentrically and obliquely relatively to said horizontal trunnions, whereby the shell can be adjusted obliquely without interference with the alinement of the horizontal trunnions, substantially as described.

2. A grinding mill comprising in combination a cylindrical metal shell lined with hard material, fixed horizontal hollow trunnions whereon said shell is mounted longitudinally, means for rotating the shell and means for adjusting the shell eccentrically and obliquely relatively to said hollow trunnions, substantially as described.

3. A grinding mill comprising in combination a cylindrical metal shell lined with hard material, spherical ends on said shell, horizontal hollow trunnions whereon the shell is mounted longitudinally, flanges on said tl'nnnions and corresponding in contour my name in the presence of two subscribing to the ends of the shell, means for adjust- Witnesses. abl securin said fian 'es to the shell ends s10t s in said shell ends 5nd detachable filling CHRISTOPHER HESKEPH HAMILTON 5 pieces for closing said slots, substantially as \Vitnesses:

described. REGINALD EATON ELLIS,

In Witness whereof I have hereunto signed ROBERT MILTON SPEARPOIN'I'. 

